Contents  on 8 September '19

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. To keep track of what's new each day, watch the Chronology section.

Traffic Report  on 8 September '19

Nine objects reported inside ten LD

Bulletin - 2303 UTC:  Two new discoveries of close passers have been announced.

Earth passageI D~Size~Inside ten LDNotes
1.11 LD at 0614 UTC Sept. 42019 RB210 m Aug. 28 - Sept. 11MPEC
1.36 LD at 1913 UTC tomorrow2019 RG211 m yesterday - Sept. 12MPEC


There are nine minor planets reported inside ten lunar distances (LD) of Earth today. The two closest are intruder 2019 RC1, outbound from 2.56 to 7.08 LD, and 2019 QY4, inbound from 4.35 to 3.09 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
0.48 LD yesterday 2019 RC1 6 m  2.56 to 7.08 LD Sept. 5 - 9 intruder
2.50 LD Sept. 10 2019 QY4 9 m  3.09 from 4.35 LD Sept. 4 - 15 NHATS target - DOU
3.53 LD Sept. 4 2019 RF1 5 m  5.90 to 7.03 LD Aug. 28 - Sept. 11
4.52 LD yesterday 2019 RA 28 m  4.62 to 5.03 LD Aug. 31 - Sept. 14 NHATS target - DOU
6.11 LD Sept. 6 2019 RD1 14 m  6.85 to 7.70 LD Sept. 1 - 11
6.96 LD Sept. 10 2019 RH 22 m  8.65 from 11.32 LD today - Sept. 12 enters ten LD - DOU
8.1   LD Sept. 5* 2019 RM1 9 m  8.9 to 9.7 LD Sept. 2 - 9 *Earth passage uncertainty +/-
6 mins., NHATS target
9.68 LD tomorrow 2019 RX1 28 m  9.68 from 10.21 LD today - tomorrow NEW, enters ten LD, risk - MPEC
9.69 LD tomorrow 2019 QZ3 38 m  9.72 from 9.98 LD yesterday - Sept. 10 NHATS target - DOU
Approaching Traffic
7.89 LD Sept. 21 2017 SL16 23 m  19.06 from 20.36 LD Sept. 16 - 25 NEW, NHATS target

This report was generated at 2010 UTC with the discoveries of inbound 2019 RX1 (MPEC) and already departed 2019 RW1 (MPEC), which passed our planet at about 7.13 LD on August 27th. Today's DOU MPEC has follow-up for inbound objects 2019 RH, 2019 QY4, and 2019 QZ3, outbound 2019 RA, and departed risk-listed 2019 QU3, plus astrometry from last month for risk-listed 2019 QS. Today we also add to this reporting 2017 SL16, which is returning but hasn't been recovered yet.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center. This puts a focus on some of the most important and very best NEO observation work, representative of the much larger NEO discovery and tracking effort. Object temporal distances are derived by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 8 September '19

The MPC's NEO Confirmation Page has 81 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 81 objects listed. Of these, 33 were "one nighters." So far The Tracking News has counted a total of 111 listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 8 September '19

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been nineteen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2019-R81 - "23:15 UT" - 2019 RO2


MPEC 2019-R80 - "22:07 UT" - 2019 RH2


MPEC 2019-R79 - "22:01 UT" - 2019 RG2


MPEC 2019-R78 - "21:58 UT" - 2019 RF2


MPEC 2019-R77 - "21:54 UT" - 2019 RE2


MPEC 2019-R76 - "21:51 UT" - 2019 RD2


MPEC 2019-R75 - "21:46 UT" - 2019 RC2


MPEC 2019-R74 - "21:38 UT" - 2019 QK8


MPEC 2019-R73 - "21:35 UT" - 2019 RB2


MPEC 2019-R72 - "21:31 UT" - 2019 RA2


<< DOU on 8 September '19 >>  MPEC 2019-R71 - "12:06 UT" - Daily Orbit Update


MPEC 2019-R70 - "06:48 UT" - 2019 RZ1


MPEC 2019-R69 - "06:46 UT" - 2019 RY1


MPEC 2019-R68 - "06:42 UT" - 2019 RX1


MPEC 2019-R67 - "06:29 UT" - 2019 RW1


MPEC 2019-R66 - "06:25 UT" - 2019 RV1


MPEC 2019-R65 - "06:20 UT" - 2019 RU1


MPEC 2019-R64 - "05:45 UT" - 2019 RS1


MPEC 2019-R63 - "05:40 UT" - 2019 RR1

Observers  on 8 September '19

A total of 35 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2019-R79 -- 2019 RG2
H21Astronomical Research Obs. Westfield in Illinois, 34 in MPECs 2019-R63, 2019-R64, 2019-R65, 2019-R66, 2019-R67, 2019-R68, 2019-R69, 2019-R70, 2019-R71, 2019-R72, 2019-R73, 2019-R75, 2019-R76, 2019-R80 & 2019-R81 -- 2019 RZ1, 2019 RY1, 2019 RY, 2019 RX1, 2019 RW1, 2019 RV1, 2019 RU1, 2019 RS1, 2019 RR1, 2019 RO2, 2019 RH2, 2019 RD2, 2019 RC2, 2019 RB2, 2019 RB1, 2019 RA2, 2019 RA, 2019 QY5, 2019 QX5, 2019 QW4, 2019 QV, 2019 QO6, 2019 QD3, 2019 QD2, 2019 QC7, 2019 QC6, 2019 QC2, 2019 PW1, 2019 PS2, 2019 PD2, 2019 OP2, 2019 JP2, 2019 GT3, 2019 GD3
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2019-R71 -- 2019 PE2
160Castelmartini Obs. in Italy, 16 in MPEC 2019-R71 -- 2019 RY, 2019 QZ3, 2019 PP1, 2019 PE2, 85709, 524603, 503960, 492143, 467475, 450160, 424089, 326742, 248926, 18172, 108906, 2100
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2019-R67, 2019-R68 & 2019-R73 -- 2019 RX1, 2019 RW1, 2019 RB2
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 4 in MPECs 2019-R70, 2019-R71, 2019-R76 & 2019-R78 -- 2019 RZ1, 2019 RF2, 2019 RD2, 2008 RH1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2019-R72, 2019-R74, 2019-R76, 2019-R79, 2019-R80 & 2019-R81 -- 2019 RO2, 2019 RH2, 2019 RG2, 2019 RD2, 2019 RA2, 2019 QK8
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2019-R68 & 2019-R79 -- 2019 RX1, 2019 RG2
734Farpoint Obs. in Kansas, 4 in MPECs 2019-R65, 2019-R66, 2019-R71 & 2019-R73 -- 2019 RY, 2019 RV1, 2019 RU1, 2019 RB2
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2019-R65, 2019-R67 & 2019-R71 -- 2019 RW1, 2019 RU1, 2019 GD3
K88GINOP-KHK in Hungary, 1 in MPEC 2019-R69 -- 2019 RY1
J95Great Shefford Obs. in England, 6 in MPECs 2019-R65, 2019-R66, 2019-R68, 2019-R71 & 2019-R79 -- 2019 RY, 2019 RX1, 2019 RV1, 2019 RU1, 2019 RG2, 2019 QE1
U68JPL SynTrack Robotic Telescope, 1 in MPEC 2019-R71 -- 526825
585Kiev Comet Station in Ukraine, 1 in MPEC 2019-R71 -- 2019 QS
246KLENOT in the Czech Republic, 1 in MPEC 2019-R69 -- 2019 RY1
Z43Landehen Obs., 1 in MPEC 2019-R71 -- 237805
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2019-R74 -- 2019 QK8
V37LCO McDonald Obs. in Texas, 1 in MPEC 2019-R71 -- 2019 GT3
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2019-R65, 2019-R66, 2019-R68, 2019-R69, 2019-R70 & 2019-R75 -- 2019 RZ1, 2019 RY1, 2019 RX1, 2019 RV1, 2019 RU1, 2019 RC2
568^R. Wainscoat on Mauna Kea in Hawaii, 5 in MPECs 2019-R63, 2019-R71, 2019-R74, 2019-R77 & 2019-R80 -- 2019 RY, 2019 RR1, 2019 RH2, 2019 RE2, 2019 QK8
711McDonald Obs. in Texas, 7 in MPECs 2019-R65, 2019-R66, 2019-R68, 2019-R69, 2019-R71 & 2019-R75 -- 2019 RY1, 2019 RY, 2019 RX1, 2019 RV1, 2019 RU1, 2019 RC2, 2019 GD3
474Mt. John Obs. in New Zealand, 11 in MPECs 2019-R63, 2019-R66, 2019-R71 & 2019-R77 -- 2019 RY, 2019 RV1, 2019 RR1, 2019 RE2, 2019 QU2, 2019 QT4, 2019 QT2, 2019 QC4, 2019 PZ2, 2019 PD3, 2019 GD3
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2019-R64, 2019-R65, 2019-R66, 2019-R68, 2019-R69, 2019-R70, 2019-R75, 2019-R76, 2019-R78 & 2019-R79 -- 2019 RZ1, 2019 RY1, 2019 RX1, 2019 RV1, 2019 RU1, 2019 RS1, 2019 RG2, 2019 RF2, 2019 RD2, 2019 RC2
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPECs 2019-R63, 2019-R69, 2019-R70, 2019-R71, 2019-R72, 2019-R74, 2019-R77, 2019-R80 & 2019-R81 -- 2019 RZ1, 2019 RY1, 2019 RY, 2019 RR1, 2019 RO2, 2019 RH2, 2019 RE2, 2019 RB1, 2019 RA2, 2019 QK8, 2019 GD3
K63Pascoli Obs. in Italy, 2 in MPECs 2019-R65 & 2019-R71 -- 2019 RU1, 163760
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2019-R69 -- 2019 RY1
C95SATINO-1 in France, 1 in MPEC 2019-R71 -- 2015 RZ35
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2019-R71 -- 516984, 29075
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2019-R76 -- 2019 RD2
W34Squirrel Valley Obs. in North Carolina, 3 in MPECs 2019-R65, 2019-R68 & 2019-R71 -- 2019 RY, 2019 RX1, 2019 RU1
I93St. Pardon de Conques Obs. in France, 5 in MPECs 2019-R65, 2019-R67, 2019-R68, 2019-R71 & 2019-R77 -- 2019 RY, 2019 RX1, 2019 RW1, 2019 RU1, 2019 RE2
I52Steward Obs. Mt. Lemmon Station in Arizona, 18 in MPECs 2019-R63, 2019-R64, 2019-R65, 2019-R66, 2019-R67, 2019-R68, 2019-R69, 2019-R70, 2019-R71, 2019-R73, 2019-R75 & 2019-R79 -- 2019 RZ1, 2019 RY1, 2019 RY, 2019 RX1, 2019 RW1, 2019 RV1, 2019 RU1, 2019 RS1, 2019 RR1, 2019 RH, 2019 RG2, 2019 RC2, 2019 RC, 2019 RB2, 2019 QY4, 2019 QL4, 2019 QE1, 2019 PG1
Z52The Studios Obs., 1 in MPEC 2019-R71 -- 2059
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2019-R71 -- 2019 QU3
L01Visnjan Obs., 13 in MPECs 2019-R63, 2019-R64, 2019-R65, 2019-R66, 2019-R67, 2019-R68, 2019-R69, 2019-R70, 2019-R71, 2019-R73, 2019-R75 & 2019-R77 -- 2019 RZ1, 2019 RY1, 2019 RY, 2019 RX1, 2019 RW1, 2019 RV1, 2019 RU1, 2019 RS1, 2019 RR1, 2019 RE2, 2019 RC2, 2019 RB2, 2019 GD3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 September '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL and NEODyS listings is 100 years, and both post impact solutions beyond that for some special objects.
For the latest official risk assessments, and for explanations of the terminology, see the NASA/JPL Sentry and NEODyS CLOMON2 risk pages.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2019 RC2JPL Sentry23582052-21192802.202547e-07-5.63-6.760JPL: Computed at 16:31 today Pacific time based on 23 observations spanning 1.9685 days (2019-Sep-05.42322 to 2019-Sep-07.391712). Diameter approximately 0.111 km. from weighted mean H=22.41.
2019 RX1NEODyS1650203711.22e-09-8.64-8.640NEODyS: "Based on 51 optical observations (of which 1 are rejected as outliers) from 2019-09-05.383 to 2019-09-08.089."
2019 QU3JPL Sentry16502113-211729.321231e-06-7.26-7.260JPL: Computed at 06:32 today Pacific time based on 23 observations spanning 11.204 days (2019-Aug-27.34466 to 2019-Sep-07.548659). Diameter approximately 0.006 km. from weighted mean H=28.70.
NEODyS16502060-2117101.26e-05-7.02-7.270NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2019-08-27.345 to 2019-09-07.549."
2019 QSJPL Sentry16502096-209612.249e-07-6.46-6.460JPL: Computed at 06:30 today Pacific time based on 71 observations spanning 6.9455 days (2019-Aug-21.28111 to 2019-Aug-28.2266). Diameter approximately 0.037 km. from weighted mean H=24.80.
NEODyS1650209613.97e-08-7.23-7.230NEODyS: "Based on 72 optical observations (of which 1 are rejected as outliers) from 2019-08-21.282 to 2019-08-28.227."
2008 EM68JPL Sentry16502019-211610961.08601741e-05-5.57-6.250JPL: Computed at 00:27 April 7th of 2017 Pacific time based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183). Diameter approximately 0.010 km. from weighted mean H=27.72.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 8 September '19

Times are UTC for when items were noted or added by The Tracking News.

2358Noted that JPL Sentry has posted 2019 RC2 as an impact risk - see above
2330Grabbed MPEC 2019-R81 - 2019 RO2 - see above
2230Grabbed MPEC 2019-R79 - 2019 RG2 - see above
Grabbed MPEC 2019-R80 - 2019 RH2 - see above
2200Grabbed MPEC 2019-R72 - 2019 RA2 - see above
Grabbed MPEC 2019-R73 - 2019 RB2 - see above
Grabbed MPEC 2019-R74 - 2019 QK8 - see above
Grabbed MPEC 2019-R75 - 2019 RC2 - see above
Grabbed MPEC 2019-R76 - 2019 RD2 - see above
Grabbed MPEC 2019-R77 - 2019 RE2 - see above
Grabbed MPEC 2019-R78 - 2019 RF2 - see above
2010Generated Traffic Report
1650Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
Noted that JPL Sentry has updated its 2019 QS risk assessment - see above
Noted that NEODyS has updated its 2019 QS risk assessment - see above
Noted that JPL Sentry has updated its 2019 QU3 risk assessment - see above
Noted that NEODyS has updated its 2019 QU3 risk assessment - see above
Noted that NEODyS has posted 2019 RX1 as an impact risk - see above
Grabbed MPEC 2019-R65 - 2019 RU1 - see above
Grabbed MPEC 2019-R66 - 2019 RV1 - see above
Grabbed MPEC 2019-R67 - 2019 RW1 - see above
Grabbed MPEC 2019-R68 - 2019 RX1 - see above
Grabbed MPEC 2019-R69 - 2019 RY1 - see above
Grabbed MPEC 2019-R70 - 2019 RZ1 - see above
Grabbed MPEC 2019-R71 - Daily Orbit Update - see above
0550Grabbed MPEC 2019-R63 - 2019 RR1 - see above
Grabbed MPEC 2019-R64 - 2019 RS1 - see above